Incorrect list style image alignment in Opera

I cannot get my custom list item bullets to be rendered correctly in Opera. You can see the problem in the image below. Can anyone point me in the right direction? Here is the css that I’m using to style the lists.

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<strong></strong> to make things bold
<em></em> to emphasize
<ul><li> or <ol><li> to make lists
<h3> or <h4> to make headings
<pre></pre> for code blocks
<code></code> for a few words of code
<a></a> for links
<img> to paste in an image (it'll need to be hosted somewhere else though)
<blockquote></blockquote> to quote somebody